Please confirm the following

• This bug is not in another current issue
• This report is not a general support request. If it is, join the Discord

Minecraft version

1.21.1

Mod version

4.0.0-beta

Describe the bug

Creating a second Altar in the world will crash the game
Removing the first Altar also crashes the game and bricks the world

Game Log

https://gist.github.com/QuinceCat/4effba90ed11b4188a01a4fe22c47590

Additional mods

Yes

Mod List or Modpack

Just enough Items

I cannot replicate this

Fixed, update pushed.